- 您现在的位置：买卖IC网 > PDF目录67412 > FAN5019MTCX_NL (FAIRCHILD SEMICONDUCTOR CORP) SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO28 PDF资料下载
参数资料
| 型号： | FAN5019MTCX_NL |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | LEAD FREE, TSSOP-28 |
| 文件页数： | 17/30页 |
| 文件大小： | 781K |
| 代理商： | FAN5019MTCX_NL |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页当前第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
FAN5019
PRODUCT SPECIFICATION
24
REV. 1.0.7 1/5/04
()
VID
O
X
RT
VID
RT
L
DS
D
O
E
V
R
C
n
V
D
n
L
V
R
A
R
n
R
×
×
+
×
+
×
+
×
=
1
2
(25)
(
)
X
O
X
O
X
A
R
L
R
C
T
'
×
+
×
=
(26)
(
)
s
m
pH
m
mF
T
A
79
.
4
0
.
1
6
.
0
3
.
1
3
.
1
375
6
.
0
3
.
1
56
.
6
=
×
+
×
=
()
X
O
X
B
C
R
T
×
+
=
'
(27)
()
=
×
×
×
+
×
+
×
+
×
=
m
V
m
mF
V
nH
V
m
R
E
3
.
55
5
.
1
3
.
1
56
.
6
3
974
.
0
375
.
0
1
650
2
5
.
1
974
.
0
6
.
1
95
.
5
3
.
1
3
This limit can be adjusted by changing the ramp voltage VR.
But make sure not to set the per-phase limit lower than the
average per-phase current (ILIM/n).
There is also a per phase initial duty cycle limit determined
by:
For this example, the maximum duty cycle is found to be
0.2696.
Feedback Loop Compensation Design
Optimized compensation of the FAN5019 allows the best
possible response of the regulator’s output to a load change.
The basis for determining the optimum compensation is to
make the regulator and output decoupling appear as an
output impedance that is entirely resistive over the widest
possible frequency range, including DC, and equal to the
droop resistance (RO). With the resistive output impedance,
the output voltage will droop in proportion with the load
current at any load current slew rate; this ensures the optimal
positioning and allows the minimization of the output
decoupling.
With the multimode feedback structure of the FAN5019, one
needs to set the feedback compensation to make the con-
verter’s output impedance work in conjunction with the out-
put decoupling to meet this goal. There are several poles and
zeros created by the output inductor and decoupling capaci-
tors (output lter) that need to be compensated for.
A type-III compensator on the voltage feedback is adequate
for proper compensation of the output lter. The expressions
given in Equations 25–29 are intended to yield an optimal
starting point for the design; some adjustments may be nec-
essary to account for PCB and component parasitic effects
(see the Tuning Procedure for the FAN5019 section).
The rst step is to compute the time constants for all of the
poles and zeros in the system:
where, for the FAN5019, R’ is the PCB resistance from the
bulk capacitors to the ceramics and where RDS is approxi-
mately the total low-side MOSFET ON resistance per phase
at 25C. For this example, AD is 5, VRT equals 0.974V, R’ is
approximately 0.6m
(assuming a 4-layer motherboard) and
LX is 375pH for the eight Al-Poly capacitors.
The compensation values can then be solved for using the
following:
RT
BIAS
MAX
COMP
MAX
V
D
×
=
)
(
(24)
()
s
mF
m
TB
97
.
1
56
.
6
3
.
1
6
.
0
.
1
=
×
+
=
E
VID
SW
DS
D
RT
C
R
V
f
R
A
L
V
T
×
×
×
=
2
(28)
s
m
V
kHz
m
nH
V
TC
86
.
6
3
.
55
5
.
1
228
2
95
.
6
5
650
974
.
0
=
×
×
×
×
=
(
)
O
Z
O
X
O
Z
X
D
R
C
R
C
R
C
T
×
+
×
=
'
2
(29)
()
(
)
ns
m
F
m
mF
m
F
mF
TD
500
3
.
1
220
6
.
0
3
.
1
56
.
6
3
.
1
220
56
.
6
2
=
×
+
×
×
=
B
E
A
O
A
R
T
R
n
C
×
=
(30)
pF
k
m
s
m
CA
253
33
.
1
3
.
55
79
.
4
3
.
1
3
=
×
×
×
=
=
k
pF
s
C
T
R
A
C
A
1
.
27
253
86
.
6
(31)
nF
k
s
R
T
C
B
48
.
1
33
.
1
97
.
1
=
=
(32)
pF
k
ns
R
T
C
A
D
FB
5
.
18
1
.
27
500
=
=
(33)
相关PDF资料 |
PDF描述 |
|---|---|
| FAN5037MX_NL | SWITCHING CONTROLLER, PDSO8 |
| FAN5037M_NL | SWITCHING CONTROLLER, PDSO8 |
| FAN5061M | SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| FAN5201MSA | 6 A BATTERY CHARGE CONTROLLER, 275 kHz SWITCHING FREQ-MAX, PDSO24 |
| FAN5361UMP10X | SWITCHING REGULATOR, DSO6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN501MPX | 制造商:Fairchild Semiconductor Corporation 功能描述:PWM CONTROLLER - Tape and Reel |
| FAN5020_AAC3116B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5021_AAC3026B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5026 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual DDR/Dual-output PWM Controller |
| FAN5026_11 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual DDR / Dual-Output PWM Controller |
发布紧急采购，3分钟左右您将得到回复。